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YK-11 Myostatin Inhibitor, 5 mg

4.70 out of 5
(192 customer reviews)


SKU: YK11-5MG Category: Tags: , , , ,


YK-11 (Myostatin Inhibitor) Research Profile:

dependent on stack
dependent on stack
dependent on stack
dependent on stack

Description: Myostatin inhibitor -- reduces muscle-growth limitations imposed by naturally-occurring myostatin protein.

Known for: Inhibiting effects of Myostatin

Commonly stacked with: Typical bulking stack: YK-11, MK-677 and RAD-140/or/LGD-4/or/S-4/or/S-23 | optional: MK-2866

Side-effects: Very few reports of adverse side-effects


YK-11 (Myostatin Inhibitor) Chemical Profile:

Clinical data

Selective Androgen Receptor Modulator, Myostatin Inhibitor
YK-11, YK11, (17α,20E)-17,20-[(1-methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna-4,20-diene-21-carboxylic acid methyl ester
By mouth
US: Investigational New Drug
Excenen Pharmatech, ChemIDplus

Pharmacokinetic data

6-10 hours


Methyl (2E)-2-[(8R,9S,10R,13S,14S,17S)-2'-methoxy-2', 13-dimethyl-3-oxospiro[1,2,6,7,8,9,10,11,12,14,15, 16-dodecahydrocyclopenta[a]phenanthrene -17,5'-1,3-dioxolane]-4'-ylidene]acetate

Chemical and physical data

430.54 g/mol
C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@@]24/C(=C\ C(=O)OC)/OC(O4)(C)OC)CCC5=CC(=O)CC[C@H]35
1S/C25H34O6/c1-23-11-9-18-17-8-6-16(26) 13-15(17)5-7-19(18)20(23)10-12-25(23)21(14-22(27) 28-3)30-24(2,29-4)31-25/h13-14,17-20H,5-12H2,1- 4H3/b21-14+/t17-,18+,19+,20-,23-,24?,25+/m0/s1


* These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. Selective Androgen Receptor Modulators (SARMs) have not been approved in the US by the FDA for human consumption as dietary supplements. In accordance with US laws pertaining to the use of Investigational New Drugs (IND's) products labeled as SARMs on this website are sold for laboratory and clinical research purposes only, are intended solely for investigational use, and are to be used exclusively for purposes of a clinical trial that is the subject of an effective investigational new drug application; otherwise, you are not authorized to purchase our products. By using this site and/or purchasing our products, you certify you and/or your organization is/are qualified to possess, handle, and administer the products you purchase, that SARMTECH and its owners/agents are not liable for any unintended effects or outcomes, and that you are 21 years of age or older.


192 reviews for YK-11 Myostatin Inhibitor, 5 mg

  1. 5 out of 5

    Paul Celico (verified owner)


  2. 3 out of 5

    Darryl E. (verified owner)


  3. 5 out of 5

    Jensen M. (verified owner)

    Amazing for strength.

  4. 5 out of 5

    Anonymous (verified owner)

    Good results. Satisfied

  5. 5 out of 5

    Cristian Figueroa (verified owner)


  6. 4 out of 5

    Allen (verified owner)

    Researched this on a subject with a staggered stack. It certainly seemed to enhance other SARMS, but alone is not so noticeable.

  7. 5 out of 5

    Issam Kharusi (verified owner)


  8. 5 out of 5

    Jacob (verified owner)

    Amazing product. Definitely a true myostatin inhibitor. Rapid strength gains when used alone. However there is a synergy with Testalone.

  9. 3 out of 5

    Nicolas (verified owner)


  10. 4 out of 5

    Edgar Lomeli (verified owner)


  11. 5 out of 5

    Nathan (verified owner)


  12. 5 out of 5

    Phillip McCrory (verified owner)


  13. 5 out of 5

    David P. (verified owner)


  14. 5 out of 5

    Anonymous (verified owner)

    This is a really good product, I’m very pleased with the results.

  15. 5 out of 5

    Kirk Townsend (verified owner)


  16. 5 out of 5

    Bruce (verified owner)


  17. 5 out of 5

    Anonymous (verified owner)


  18. 5 out of 5

    Justin J. (verified owner)


  19. 5 out of 5

    alan cucchiella (verified owner)

    Added size strength and great gains

  20. 3 out of 5

    Andrew B. (verified owner)

    I have performed research with many sarms. Sarmtech is good but not as potent as others available.

  21. 5 out of 5

    Anonymous (verified owner)


  22. 5 out of 5

    Nathan (verified owner)


  23. 5 out of 5

    Donovan Mewhorter (verified owner)


  24. 5 out of 5

    Mike H. (verified owner)


  25. 5 out of 5

    Sandra (verified owner)

    Works great

  26. 5 out of 5

    Mark T. (verified owner)

    Stacked with ostarine cardarine, muscles always feeling very tight. Researching subject is looking and feeling awesome!

  27. 4 out of 5

    edith Croteau (verified owner)


  28. 5 out of 5

    barak k. (verified owner)


  29. 4 out of 5

    Kristopher Morrow (verified owner)

    love it

  30. 5 out of 5

    Daniel (verified owner)


  31. 5 out of 5

    Aaron R. (verified owner)

    Give it a week. 5 mg in the morning and 5 mg 6 hours later. Insane pumps and slow but steady growth. Strength gains show up after a day or two. Great product!!

  32. 5 out of 5

    Eddie S. (verified owner)

    I’m using a stack so I can’t comment on each product individually but very happy with my results.

  33. 5 out of 5

    RICK L. (verified owner)


  34. 5 out of 5

    Tyler Z. (verified owner)

    Ran a 6 week cycle, 18 year old and great results, yk maybe not the best for bulking but it gives you that clean chiseled hard look!

  35. 5 out of 5

    aaron (verified owner)


  36. 5 out of 5

    Fahed abdelqader (verified owner)

    Strong power

  37. 3 out of 5

    Bruno Delmarquette (verified owner)


  38. 5 out of 5

    Anonymous (verified owner)

    With this and rad my subject has seen huge jumps in strength and size

  39. 5 out of 5

    matthew (verified owner)

    When testing with rad140, my subject doesn’t want to get off the stuff. Great combination.

  40. 4 out of 5

    Sam S. (verified owner)

    The best way to describe YK-11 is a SARMs booster. It increases your gains when stacked with RAD140, S-4, Ostarine, S-23 and LGD-4033. If you’re looking to boost your test subjects gains on your next SARM cycle include YK-11.

  41. 5 out of 5

    Todd (verified owner)

    Just started, 1 week in, feeling good

  42. 5 out of 5

    Mike Vamos (verified owner)

    A crucial component in sarming, and it does the trick!

  43. 5 out of 5

    William (verified owner)


  44. 3 out of 5

    Tim C. (verified owner)

    Not as much gains as I hoped but test subject did have some increases.

  45. 5 out of 5

    Michael (verified owner)


  46. 5 out of 5

    Donovan Mewhorter (verified owner)


  47. 4 out of 5

    Alex (verified owner)


  48. 5 out of 5

    Cody (verified owner)

    The product is amazing progress is unreal

  49. 3 out of 5

    Rick Bronswick (verified owner)

    Subject took 5 mgs twice/day. Muscles look fuller and harder. I can’t comment on if any strength gains since subject wasn’t lifting while using yk11. Just mma. And no changes in performance – as i wasn’t expecting any.

  50. 5 out of 5

    Sandra (verified owner)

    Always Great ordering process

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